package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
public class SetmealServiceImpl implements SetmealService {
    @Autowired
    SetmealMapper setmealMapper;

    @Autowired
    SetmealDishMapper setmealDishMapper;

    /**
     * 套餐列表分页查询
     *
     * @param setmealPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        PageHelper.startPage(setmealPageQueryDTO.getPage(), setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);

        Long total = page.getTotal();
        List<SetmealVO> res = page.getResult();
        return new PageResult(total, res);
    }

    @Transactional
    @Override
    public void saveSetmealWhithDish(SetmealDTO setmealDTO) {
        // 保存套餐
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        setmealMapper.insert(setmeal);

        // 保存套餐下关联的菜品
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        if (setmealDishes != null & setmealDishes.size() > 0) {
            for (SetmealDish setmealDish : setmealDishes) {
                setmealDish.setSetmealId(setmeal.getId());
            }
            setmealDishMapper.insert(setmealDishes);
        }

    }

    /**
     * 查询套餐详情
     *
     * @param id
     * @return
     */
    @Override
    public SetmealVO getById(Long id) {
        Setmeal setmeal = setmealMapper.getById(id);
        List<SetmealDish> setmealDishes = setmealDishMapper.getBySetmealId(id);

        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal, setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);
        return setmealVO;
    }

    /**
     * 批量删除
     *
     * @param ids
     */
    @Override
    public void batchDelete(List<Long> ids) {
        // 启售状态不能删除
        for (Long id : ids) {
            Setmeal setmeal = setmealMapper.getById(id);
            Integer status = setmeal.getStatus();
            if (status == StatusConstant.ENABLE) {
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        }
        // 同时删除套餐下对应的菜品
        for (Long id : ids) {
            setmealDishMapper.deleteBySetmealId(id);
        }

        setmealMapper.batchDelete(ids);
    }

    /**
     * 修改套餐
     *
     * @param setmealDTO
     */
    @Override
    public void update(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);

        setmealMapper.update(setmeal);

        // 删除菜品
        Long setmealId = setmealDTO.getId();
        setmealDishMapper.deleteBySetmealId(setmealId);

        // 重新插入菜品
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        if (setmealDishes != null & setmealDishes.size() > 0) {
            for (SetmealDish setmealDish : setmealDishes) {
                setmealDish.setSetmealId(setmeal.getId());
            }

            setmealDishMapper.insert(setmealDishes);
        }

    }

    /**
     * 菜品停用启用
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        if (status == StatusConstant.ENABLE) {
            List<Dish> dishes = setmealDishMapper.getDishsBySetmealId(id);
            for (Dish dish : dishes) {
                if (dish.getStatus() == StatusConstant.DISABLE) {
                    throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                }
            }
        }
        Setmeal setmeal = Setmeal.builder().id(id).status(status).build();
        setmealMapper.update(setmeal);
    }

    /**
     * 用户端查看套餐
     * @param categoryId
     * @return
     */
    @Override
    public List<Setmeal> list(Long categoryId) {
        List<Setmeal> setmealList = setmealMapper.list(categoryId);
        return setmealList;
    }

    /**
     * 用户端查看菜品
     * @param setmealId
     * @return
     */
    @Override
    public List<DishItemVO> getDishItemById(Long setmealId) {
        List<DishItemVO> dishes = setmealMapper.getDishItemBySetmealId(setmealId);
        return dishes;
    }
}
